ST202BDR Integrated Circuits (ICs)

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Full model: ST202BDR

Manufacturer: STMicroelectronics (STMicroelectronics)

Device type: RS-232 transceiver (dual channel)

Package: SOIC-16 (surface mount)

Operating voltage: ±12V (bus side), 3V ~ 5.5V (logic side)

Operating temperature: -40°C ~ +85°C (industrial grade)

Compliance standard: TIA/EIA-232-F

Data transmission rate: 400kbps (maximum)

ESD protection: ±15kV (human body model)

Output slew rate: 30V/μs (controlled, reduce EMI)

Supply current: 5mA (static)

Receiver input impedance: 3kΩ ~ 7kΩ

Driver output impedance: 300Ω

Description

The ST202B, ST202C is a two-driver, tworeceiver device following EIA/TIA-232 and V.28 communication standards. It is particularly suitable for applications where ± 12 V is not available. The ST202B, ST202C uses a single 5 V power supply and only four external capacitors (0.1 µF). Typical applications are in: portable computers, low power modems, interface translation, and battery-powered RS-232 networks.

Features

   1. Supply voltage range: 4.5 to 5.5 V

   2. Supply current no load (typ.): 1.5 mA

   3. Transmitter output voltage swing (typ): ± 9 V

   4. Transition slew rate (typ.): 12 V/µs

   5. Receiver propagation delay (typ.): 0.1 ms

   6. Compatible with MAX202

   7. Receiver input voltage range: ± 30 V

   8. Data rate (typ.): 400 kbps/s

   9. Operating temperature range: -40 to 85 °C, 0 to 70 °C

Pin definition (SOIC-16)

Typical application circuit

   MCU connection scheme:

             VCC(3.3V) ──── 16-pin

             GND ───────── 15-pin

             TXD ───────── 11-pin(T1IN)

             RXD ───────── 12-pin (R1OUT)

             Charge pump capacitor: 1μF ceramic capacitor (C1+/C1-, C2+/C2-)

Design considerations

   1. Charge pump capacitor selection:

       - Low ESR ceramic capacitors must be used (X7R material is recommended)

       - Capacitance range 0.1μF ~ 1μF

   2. PCB layout:

       - Charge pump capacitors should be as close to the chip as possible (trace length <10mm)

       - It is recommended to connect a 33Ω resistor in series at the RS-232 bus end to suppress ringing

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